Latch mechanism



' Oct. 19, 1937. J. H. MCDERMENT 2,096,124

LATCH MECHANISM Filed Aug. 2l, 1955 4 Sheets-Sheet l ATTORNEY.

Oct. 19, 1937. J. H. MCDERMN-r LATCH MECHANISM Filed Aug. 21, 1935 4Sheets-Sheet 2 INV f. /VM/ MMM@ m m a w Qmill.lll|l.|..||l|\|ll||||l|||||IIIIMIIIIIPIII.IlllllllllillltlllllllllllATTN NWbVQ/ Nm hw m wm mm,

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ATTORNEY.

Oct. 19, 1937. J. H. MCDERMENT LATCH MECHANI SM 4 Sheets-Sheet 3 FiledAug. 21, 1935 1NVENTOR.

ATTORNEY.

ct. 19, 1937. J. H. MCDERMNT LATCH MECHAN ISM 4 sheets-sheet 4 FiledAug. 21, 1935 w T N mv S .Q Q? w m no l.- L- -Il uuu um, lid.. m f K m lmw Bcf N I l l l fl M Nv /m\ Y @T E 7 I- :1---- l l I I l l I||,l|lllllNilllllllllllllllvhllllIl m\ bw., .Jw)- Y Patented Oct. 19,1937 UNITED STATES 2,096,124 K LATCH MECHANISM James H. McDerment,Cleveland, Ohio, assignor to The Swartwout Company, Cleveland, Ohio,

a corporation of Ohio Application August 21,

11 Claims.

This invention relates to a ventilator of the type having a dampermounted on a parallelogram linkage and adapted to be swung to and fromopen and closed position by toggle linkage actuated by a bar slidableparallel to the damper and has especial reference to the provision ofsuch a damper having a novel and eiective catch mechanism cooperatingtherewith.

An object of the invention is to provide a simple and sturdy latchmechanism, particularly suited for the requirements of such a ventilatorand to combine the same with such ventilator in' a novel and effectivemanner. Y

With the foregoing and other and more limited objects in view, asgwillbecome apparent, the invention consists in all the novel features ofconstruction o-f the latch mechanism and its cooperation with theremainder of the ventilator mechanism and to the novel arrangements ofparts 2()v hereinafter described and illustrated in the accompanyingdrawings wherein Fig. 1 is a transverse section correspondingsubstantially to the line I-I of Fig. 2; Figs. 2 and 2a make up afragmentary central vertical section with parts broken away and showingthe parts in the relative positions occupied when the damper is closedFig. 3 is a View similar to a portion of Fig. 2 but showing the parts inan intermediate position between closed and open positions of thedamper; 30 Fig. 4 is a View similar to Fig. 3 but showing the parts inthe relations occupied when the damper is open; Figs. 5 and 5a make up afragmentary section Vcorresponding substantially to the line 5-5 of Fig.l; and Figs. 6 to 8 inclusive are sectional views corresponding to thelines 3 6, 1 7, and 8-8 of Figs. 2, 3, and 4 respectively.

By reference to Fig. 1, it will be seen that my improved ventilator isapplicable to, for example, a building roof indicated by the numeral I9and carrying upwardly converging sheet metal elementsV II having theirupper edges secured together at intervals by bars I2 extendingthereacross and riveted thereto as well as to bows I3 having lowerportions lying along the elements I I and vertically extending portionspositioned adjacent the upper edges of the elements II and connectedtogether by upper bight portions. The bight portion of the elements I3merges with the legs thereof by flattened corners to which is secured aridge roll I4. Upwardly and outwardly extending supporting bars I5 aresecured to the ridge roll I4, supported by the bows I3 and provide,supports for the upper edges of bale elements I6 which are attached attheir lower edges to the elements I3, in any suitable manner. As will be1935, serial No. 37,197

clear from Fig. 1, the elements II terminate in vertical portions Ilupon which the outerY edges of a damper I8 are adapted to rest. Securedto the damper I8 and extending thereacross at intervals Y are straps I9to the ends of which' are pivotally f5 connected links 29. 'I'he upperends of the links 29 are pivoted to the bows I3,as indicated at 2l.Disposed beneath the damper I8 and held in position by suitable guides22 is a slidably mounted bar 23 to which is pivotally connected at 24`all?) link 25 in turn pivoted at 26 to the damp'erIS. It will be obviousthat when the bar 23 is reciprocated, motion will be transmitted throughthe link 25 to the damper I8 with the result thatthe same will be swungon its parallelogram-linkage. 15

Any suitable mechanism may be provided for reciprocating the bar 23. Inthe drawings, I have shown one suitable mechanism for the purpose whichcomprises a bracket 2'! connected to the bar 23 and carrying a sheave 28over which 12-0 passes a flexible element 29 secured at 3U to an element3l mounted on transverse members I2 Y and 32 and carrying a secondsheave 33 over which the flexible element 29 passes downward to asuitably convenient operating point. 25

Pivoted to one of the guides 22 which is mounted on one of thetransverse members I2 is a holding member 39 comprising a pair-oftriangular elements spaced from each other by posts or pins 35 and 36 atthe free side and by pins 3l passing l30 through spacing sleeves 38 andSecured in any suitable manner to the guide member 22.Y The pins 3'! maytake the form of a single pin passing entirely .through the guide member22, in which case a slot must be provided in the bar 23.` 'Ihe 35portions 35 and 33 are adapted to engage the upper and lower surfaces ofthe barv 23 to limit pivotal motion of the holding member 34ytransversely of the bar 23. Pivoted to the bar`23 at tlepoint 38 is adog 39 having a notch 4U receiving a stop 4I carriedy by the bar 23 andlimiting the downward motion of the dog 39 tothe position shown in Fig.2 while permitting anupward motion thereof about sulicient to elevatethelower end of the cam face 42' to the top of the cut-out 93 in the bar23'. Pivoted to the bar 23 in a position not to interfere with the dog39, for example, on the other side of the bar 23, is a .shifting member9, such shifting member being pivoted to the bar 23 at 45 and having itscounterclockwise motion with respect to the bar 23 limited by a stop 46.The shifting member i4 is provided with a notch 41 which is held by thepin 45 in position to engage the portion 3 5 of the ,55'

'holdin'membel i3@ upon 'Inotionof the barizs towardthe left.

The operation of the 1 catch mechanismY mayV ibe readily understood byreference to Figs. Zito 4i inclusive. When the; damper I8 is in closedVposi- Y tion, the parts4 of `the catchmechanism occur'ny,l

Y under the in'iluence of gravity,Y the'positions inportion 35 isreceivedY in theno'tchAlsiUponfuri 2 theirrmotiongthelnotchdl beingabove theY pivot the portiques 'anddroppoddowrr torno positions point45; anrjlfthe portion VBFybeing'above'rthe Vpivot the element 34Yisnmov'ing counterclockwise about Vthe pivot point'31j the portion`361Wil1 move up'- 'Wardlyinto the"'cutouti43;fithe dog 39.pivoting 'Yupwardly when the elementY 36 `engages' its' lower Y `r 'surfaceuntilivvhenrthe barVV 23 is moved g to the position'in Fig. Bftlie'lowerend of the earn face 142 of the dogV 39 willfhave passedrearwardly'of Lthe :right/'With the resultfthatthe pivot point 45' :vvillfr'noveYslightlyout fromunder theportion Y V 35, Vthereby loweringl'the portion36'to Ysome ex'- Y V.35 tentxbutrnot to aY point belo'vvfthe dogjr39.YV

Y .Whenrho 'parts Yhave reached the' position of j allowed to movetowa'rd soon las the: cam Yfac'ze'42 of the? Ydog engages the 'elementl,it Willimpart an upward motion tok 'the ho ding-memberthereby auowiogthe Wardrforce isY exerted vonv the iiexible cable 27S.A

'agement with the Yroronf einem: droom gravityinto thep'ositi'o'n ofFig.Y4, infwhich *posi-'- t tion it Willhol'dtl'iedamperjopenythatis, itvvill f prevent Vfurther motion of thebar 23 to theright l YWhenitisdesiredto close the dampen agdovvn-` Y the left. I Ayerysmallmoi-,iontotheY left/will move the dogfout o f engagement with the porf.tion 36 kand allovv'the holding member 34 to drop L 'down until theportion 35engages the upperYsur-f- 'V50 Vfaceoi' the bar 23 orthe uppersurface of the VshiftingYmei'nlo'er-V'Ml if the same should havefesuchY' ScongurationVY astoV extend above the upper sur; f lface ofthe bar atthat point.; Upon-release of the cable/"729,5theV parts will 'be freetogmove under the influence of gravityrto rthe position of 2 avev andthe-opre- Aferred, embodiment of Y my invention, YI 'rwish itVVunder'stood'that 1 am netlimtedto tledetails of the disclosure'but'only in accordance YV*the Y appended claims andthe priorY art.l

Y* *Having thus 'desc/rib claim is :Y Y

f 1.Y A- catch mechanism fforholdi'ng a bar in` longitudinally adjustedposition comprising,Y `a

' is longitudinally movable, la holding" member se-Y aooalzfiV Y ,Yholding `member,Y upon reverse motion;

. 'Y longitudinally d e my inventionglrvvhatw support in operativerelation to YWhich said barY is slidablf,Y aholdingYmemberlmoyablysecuredto move a portion of Vsaidholding,member into af"Yposition to Ybe engagedbehind said dog upon reversing the motion ofVVSaid bar. Y

2. A catch mechanism for holding a bar in v'longitudinally adjustedposition compris'ing,a'

support inoperative relation to which Asaid bar is longitudinallymovable, aholding member Y movablysecured ,to Vsaid: supportandxhavingff' portions embracing VVsaid bar andQmovable'laterf allythereoiadog carriedby andmovable-WithI V,respect to said bar forengaging one ofsaid por-1Y f Vtionstoarrest'r motion of said barfinY-one direcj 'tion, ashiiting. member carried by said barjforgf-.lengaging theYother of*y saidfportions to move said I :said barrfnftheother direction, into position 1 longitudinal A-motion'gjoi ofsaidbar'.VV Y Y Y Y Y w Ybe engaged bysaid dogupon reversing the motionpoint 3],the parts39 and Hfare'; so Ato speak?)Y Y Y Y buckled to theposition indicated in'Eig. 3f As 1 YfA catch mechanism'ior'holdingfa'flzzarV1 in longitudinally adjusted position comprisinarl Support' inoperative. relatio'nrto which said `barVV Y is; longitudinally movable,a holding "membeiiifseY cured to said' support andV movable relativetherei-` movable' with respect tors'aid bar'foi" engaging a portionofsaid holding memberto arrest 'moi ,Y YY if Y tionin one direction,anshiftingV member movably Y Y to and laterally ofsaid bar,Yovdogioarried bygone the motion of said bar;and-fmeansineludng ja i camsurface on said Vdogpfordis/engaging, said` shifting memberfrrorrifs'aid'no1eiogjrnemberuponY y such reverse motion.'V Y U 'Y 4. -Acatch mechanism!,forrrholdinggavbar l longitudinally adjustedpositionfcomprising;Y a

support in operative relation Vtogyvliichsaid bar is longitudinally.movable.' a holding?v member movablyV secured to said supportandhavingporf j tions embracing; said rbar andm'ovable laterally:

thereof, adog carriedbyrand movable Withre specttof said bar foriengaging onegof said tions'to arrest' motion of Vsaid 'bar inonegdirecrfVY tion, a shiftingmember. carried'fby saijdbar'rfor.engaging the other .offsaidrportions to movesaidV v holding' member,.upon longitudinal motionor..Y

said bar in thel other emotion, into Vpositiorrto Y yso be engagedbysaidjdog upon reversing Ythe m05Y tion offsaid bar, and means includingacamrsurfY face on said Vdorgfor `disengaging,saidshifting;

member from said vholding',y member iupon v5;*A catch mechanism-rior{bariin Y 'Support in 7:7operativerelation to. which said .bar Yis-slidable, aholding-member'Vmovablyi securedY Y v- 'B'SY Y v adjustedpositionVv comprising, kaf

to said support and'having upperfandl'ovverpor- 'P' tions ,embracingVsaid' bar,v and movable laterally e' thereoila dog vcarriedrby randmqvableYwlth rie-'- Vspect to V"said bar forvenga'ging'one ofsaldiportions'.` :Y rtolarrest, motion'of Vsaid bar in. onedirecticfimuar` shifting member pivoted to, said AbarY at a :pointbelovv'theV lowermost positionYoftthe upper of saidportions and having anotch and means former Y -senting the Vsame at' a position to,engagesaid"l j l 6. A.' catchv mechanism 'Ufor'V holdingabarin *longitudinallyradjusted positiongcomprising,@ai

upperportionfupon longitudinal motionY offrtlier Yjshiftingrrmembertoward.said holdingmember. f1

support operativerelation Vtofvvvhircl'i fsaidbar 1 Y' vsaid Vsupportand having Yupper 1 and lowerV por-l tions embracing said bar andmovable laterally thereof, a dog carried by and movable with respect tosaid bar for engaging one of said portions to arrest motion of said barin one direction, a shifting member pivoted to said bar at a point belowthe lowermost position of the upper of said portions and having a notchand means for presenting the same at a position to engage said upperportion upon longitudinal motion of the shifting member toward saidholding' member, means limiting lthe movement 'of said dog in onedirection, said dog being provided with a cam surface for engaging thelower of said portions to release said shifting member as said dogarrests the motion of said bar.

7. In a ventilator construction, in combination with means dening anopening, a damper adapted to close said opening, a support, aparallelogram linkage connecting saidV damper to said support, a barmounted for slidable motion with respect to said support, a link pivotedto said bar and to said damper, a holding member secured to said supportand movable relative thereto and laterally of said bar, a dog carried byand movable with respect to said bar for engaging a portion of saidholding member to arrest motion of said bar in one direction, a shiftingmember movably carried by said bar and means including said shiftingmember acting, upon longitudinal motion of said bar in the otherdirection, to move a portion of said holding member into a position tobe engaged behind said dog upon reversing the motion of said bar.

8. In a ventilator construction, in combination with means dening anopening, a damper adapted to close said opening, a support, aparallelogram linkage connecting said damper to said support, a barmounted for slidable motion with re spect to said support, a linkpivoted to said bar and to said damper, a holding member movabiy securedto said support and having portions emn bracing said bar and movablelaterally thereof, a

dog carried by and movable with respect to said bar for engaging one ofsaid portions to arrest motion of said bar in one direction, a shiftingmember carried by said bar for engaging the other of said portions tomove said holding member, upon longitudinal motion of said bar in theother direction, into position to be engaged by said dog upon reversingthe motion of said bar.

9. In a ventilator construction, in combination with means dening anopening, a damper adapted to close said opening, a support, aparallelogram linkage connecting said damper to said support, a barmounted for slidable. motion with respect to said support, a linkpivoted to said bar and to said damper, a holding member movthereof, adog carried by and movable with respect to said bar for engaging one ofsaid portions to arrest motion of said bar in one direction, a shiftingmember carried by said bar for engaging the other of said portions tomove said holding member, upon longitudinal motion of said bar in theother direction, into position to be engaged by said dog upon reversingthe motion of said bar, and means including a cam surface on said dogfor disengaging said shifting member from said holding member upon suchreverse motion.

10. In a ventilator construction, in combination with means defining anopening, a damper adapted to close said opening, a support, aparallelogram linkage connecting said damper to said support, a barmounted for slidable'motion with respect to said support, a link pivotedto said bar and to said damper, a holding member movably secured tosai-d support and having upper and lower portions embracing said bar andmovable laterally thereof, a dog carried by and movable with respect tosaid bar for engaging one of said portions to arrest motion of said barin one direction, a shifting member pivoted to said bar at ably securedto said support and having por-s tions embracing said bar and movablelaterally a point below the lowermost position of the upper of saidportions and having a notch and means for presenting the same at aposition to engage sai-d upper portion upon longitudinal motion of theshifting member'toward said holding member. 1l. In a ventilatorconstrctiomin combination with means defining an opening, a damperadapted to close said opening, a support, a parallelogram linkageconnecting said damper to said support, a bar mounted for slidablemotion with respect to said support, a link pivoted to said bar and tosaid damper, a holding member secured to said support and having upperand lower portions embracing said bar and movable laterallyy thereof, adog carried by and movable with respect to said bar for engaging one ofsaid portions to arrest motion of said bar in one direction, a shiftingmember pivoted to said bar at a point below the lowermost position ofthe upper of said portions and having a notch and means for presentingthe same at a position to engage said upper portion upon longitudinalmotion of the shifting member toward said holding member, means limitingthe movement of said dog in one direction, said dog being provided witha cam surface for engagingA the lower of said portions to release saidshifting member as said dog arrests the motion of said bar.

JAMES I-I. MCDERMENT.

